How can I clean the stock bottle for distilled water in a good way (with dosing intent)? How often should this happen?

This problem is known. Personally, I think that such stock bottles (which are certainly easy to use) are not really suitable for water retention.   A certain amount of air is sucked into the bottle at each decrease and over a long Use my and by the standstill of the water   can be formed over time a biofilm in the preparation. This is still very difficult to remove and will in itself constitute a continuous source of contamination.   If possibility for cleaning is suggested e and weekly cleaning of bottle and burette with a 0.3%-IgE H2O2 solution. This offers the advantage that H2O2 test strips can be obtained in the trade (detection up to 0.5 ppm), which allows to verify that no residue is present. This method is reasonably   cumbersome and consumes an important amount of water.   I have no references, which mention an examination of the feasibility and effectiveness (how long should the H2O2 Act?) of this cleaning procedure. The size Buret will be very difficult to clean. All this is the   use of smaller bottles of 1 L or the bag in box system   to consider.   pharmacist Kurt Wauters of APB is given this thanks for transferring his view to this problem.   In Another answer question, alternative options are proposed.